Car truck bolster



5 Sheets-Sheet l (HEL E; HHM/15H5 `lune 6, 1939- K. R. HAMMERSTROM GAR TRUCK BoLsTER Filed Jan. 2l, 1938 June 6, 1939- K. R. HAMMERsTRoM GAR TRUCK BOLSTER File'd'gan. 21. 1958 5 sheets-sheet s bwena:

June 6, 1939- K; R. HAMMERs-rRoM 2,151,513

GAR'TRUCK BOLSTER 5 Sheets-Sheet 4 Filed Jan. 2l, 193B WWII/lli /Qwfizl'ot' (HEL E HHMMEESTEOM June 6, 1939.

K. R. HAMMERSTROM I 2,161,513

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1V. 1|G|1| l1, w mimi 'Patented .Immv 6, 1939 UNITED STATES CAR. TRUCK BOLSTER Karl R. Hammerstrom, Dormont, Pa., assignor to The Railroad Research Bureau of the Manufacturing Companies of` Steel Corporation the United States Application January 21, 1938, Serial No. 186,219

, 6 Claims.

This invention relates generally to car truck bolsters, but is particularly concerned with bolsters of the box girder type made primarily from rolled steel parts.

'I hree specific examples of bolsters embodying the features of the invention are illustrated by the accompanying drawings, in which:

Figure 1 is a top view of the first example.

Figure 2 is a side View.

Figure 3 is a longitudinal section taken lfrom the line III-III in Figure 1.

Figures '4 and 5 are cross-sections from the lines IV--IV and V-V in Figure 2.

Figures 6 and 7 illustrate the rolled steel sec- 15 tions from which Athe bolsters top and Abottom A are formed.

Figure 8 is a horizontal cross-section of the center post construction taken from the line VIII-VIII in Figure 3. A

20 Figure 9 is atop view of the second example.

Figure 10 is a longitudinal section taken from the line X-X in Figure 9. f

Figures 11 and 12 are cross-sections taken from the lines XI-XI and XII- XII in Figure 10.

Figure 13 is a longitudinal section taken from the line XIII-XIII in Figure 9.

Figure 14 shows in detail a brace-plate used within the end or spring seat portion of the bolster forming the second example.

Figure 15 is a top view of the third examplei Figure 16 is a longitudinal sectional view taken from the line XVI-XVI in Figure 15.

Figures 17 and 18 are cross-sections taken from the lines XVII-XVII and XVIII-XVIII in Fig- 35- ure 16.

Figure 19 is a detail showing of a brace-plate used within the end or spring seat portion of this third example.

Figure 20 is a detailed showing of a brace-plate 40 used within the bolster constituting this third example beneath the side bearing supporting por-v tion of the same.

In the case of the first example, the top member of the bolster is made from the rolled steel chan- 45 nel section shown by Figure 6, this section having a web I l and flanges 2, and being characterized in that parallel longitudinallyextending in elongated form, the necessary center-plate l 55 5 having a depending bossi which fits this open- (Cl. 10S-2216) ing. t lThe plate 5 is welded to the bolster top, the

which would interrupt the straight continuity of the bolster sides.

The rolled steel section shown by Figure 7 is pressed or drawn to form the bolster bottom, this section being rolled to provide a thickened central portion 'I and relatively thin side portions 3, the latter, after the pressing or drawing, extending upwardly as flanges which meet the flanges 2 of the channel section shown by Figure 6 and forming the bolster, top, the abutting flange edges being joined by welding. The pressing or drawing of the bolster bottom is so conducted as to provide a deepened central section having a dat bottom or web beneath the center-plate and straight extending diagonal portions which are flattened into horizontal portions, where neces' strength throughout due to the ribs 3 which in- `tegrally depend from the web I of the section constituting this top, these ribs extending straight through the central portion ofthe bolser as contrasted to deviating 'or discontinuing at this point. v

A center post is positioned between the bottomk bolster formed by the thickened portion 1 of the section shown by Figure 7, and the bottoms of the ribs 3 reenforcing` the bolster top. This center post is in the form of a suitable length of a rolled beam section, such as an I-beam section, arranged With'its web I0 parallel the bolster side Walls and its flanges II transverse the same, the section beingz arranged so that, as best shown by Figure .8, the edges" of the flanges II are spaced from the bolster side walls. To laterally support the kingpin which must be used when the bolster is in. service, arelatively heavy plate I2/is horizontally interposed between the center post and bottom of the ribs 3, Figure 4 showing that this plateis of such a width as to completely span both the ribs 3 of the bolster top and the flanges I I of the beam section forming the center post, these 'flanges II being rolled vto Widths equaling the (spread of the ribs 3. This plate I2 is provided with a kingpin hole I3 which registers with the usual kingpin hole (ia formed in the center-plate 5, and immediately below this hole I3 the web I0 of the center post beam section is cut away to provide a kingpin recess I4, ahorizontal plate I5 being positioned through this recess transversely of the bolster so as to provide a kingpin rest. This plate I5 joins the bottom edge bounding the recess I4 and also the side walls of the bolster.

Stifening of the bolster bottom at its center is effected by reenforcing bars I6 welded to the bolster bottom and to the web I0 and flanges II of the beam section. These bars are positioned on opposite sides of the web I0, the latter and the bars being arched by cutting, as at Il, immediately over a drain hole I8 formed in the bolster bottom centrally beneath the center'post for the purpose of permitting condensate drainage.'

Still further strengthening of the bolster side walls is effected immediately outside of the center-plate 5 by transverse bars I9 spaced to either side of the center post and horizontally arranged to join the side Walls. These transverse bars may not be necessary in all instances, and in cases Where extreme stresses are encountered more bars may be used at points where experience indicates they may be desirable. Vertical plates I9a may be transversely welded between the flanges 2 and 3 beneath the center plate 5.v

As previously mentioned, the ribs ,extend the length of the bolster and they are, therefore, available at the bolster end or spring seat portions for reenforcing purposes, the bottom portions of the bolster which function as spring seats being braced from the top by way of spaced parallel vertical plates 20 which join the depending ribs 3 and the bolster bottom. These plates are of sufficient length to extend at least throughout the limits of the bolster end or spring seat portions and, in the interests of complete safety, are illustrated as extending well inwardly from such portions at their tops. To produce spring seat portions of properly restricted depths, some pressing or drawing of they section constituting the bolster top, shown by Figure 6, is resorted to, this producing downwardly extending'diagonals la, the extending portions of the plates 20 preferably extending to the points at which the ribs 3 start their downward declination to provide these diagonals |a of the web I.

In connection with both this first example and also the other two examples presently to be described, the Various parts are illustrated as being interfastened, joined or positioned by metal deposited by welding methods. However, although welding is preferable, other forms of attachments may be substituted in those instances Where 4the effect desired is primarily that of positioning parts against displacement. Where the junctions of parts must carry heavy working stresses, welding is definitely deemed preferable.

The second example, shown by Figures 9 through 14, differs from the rst in that the bolster is formed from a conventional rolled channel-section having its web 2| reenforced by a smaller conventional rolled channel-section Whose web 22 is fastened to the Web 2| of the larger section, the flanges 23 of the latter and thc flanges 24 of the smaller ,channel being arranged parallel. Interiastening is effected by welding applied as shown by the drawings. The use of these interfastened channels provides a bolster construction having the same advantages as that constituting the rst example, without -ple is considered preferable.

requiring special work mill.

Since the details of the central portion of this second example are the same as those described in the first example. similar numerals followed by the letter a, are used to indicate the various parts here involved.

Certain differences exist at the end portions of this second bolster in that although the web 2| of the larger channel-section is formed to provide declinations 2|a, the smaller channel whose web 22 is Welded to this web 2| terminates at the beginning of the declinations of the latter. Reenforcement of the bolster end or spring seat portions is effected in -each instance by a vertical plate 25 of sufficient width to extend between the bolster top and bottom at the portion under discussion, welding being used to cause this plate 25 to be effective in joining the bolster top and bottom. Furthermore, the top portion of this plate 25 is suilciently long to extend well into contact with the web 22 of the smaller channel-section whose flanges provide the bolster top reenforcing ribs in this example, the bottom' portion of the platediagonally extending upwardly and the top edge of the plate being joined to the inside of the web 22 bywelding. The arrangement should be such as to4 bring the inner end portion of the plate 25 well beneathA the side bearing supporting portion of the bolster in the manner shown by the drawings.

The third example, shown by Figures 15 through 20, differs primarily from the second example in that it is designed for use with the roller lateral motion device, whereby its end or spring seat portions must be of very restricted depths. Such restriction necessitates the diagonals of the bolster bottoms being sharply angled upwardly near their junctions with the bolster end portions.

In view of the above, different bolster end reenforcing from that shown bythe second exam- This consists at each end of a short horizontal plate 26 welded to the bottom edges of the flanges 24 beneath the bolster side bearing supporting portion, a vertical plate 21 (shown by Figure 19) extending from between the plate 26 and the web 22 of the small channel into the bolster end portion and which is welded to the top and bottom of the same thereat, this plate being positioned on the center line of the bolster and being welded to the web 22 and parallel the vertical plates 28 (shown by Figure 20) which fit the shape of the bolster bottom beneath the side bearing supporting portion of its top, these plates 28 being Welded to the bolster bottom and to the plate 26 to which it extends. This plate 26 is positioned substantially at the center of the Side bearing supporting portion of the bolster top and the plates 28 are shaped to extend diagonally from the plate 26 downwardly wellA toward the central portion of the bolster, its bottom edge, as previously mentioned, being welded to the latter throughout its extent. The plate 21 is joined at its inner end bottom to the plate 26 to complete the effect of structural rigidity. The plates 22 perform a further function in that they reenforce the bolster bottom on both sides of a hand-hole 29.

l. A car truck bolster, of the box girder type having a suitable length of a rolled beam section for a center post, said section being of the type having a web with oppositely extending on the part of the steel ilanges integral with both side edges thereof, said i section being vertically positioned within the bolster with the top portion of its said web cut away to form a kingpin recess and having a plate positioned horizontally through said recess and joining the bolster side walls, said plate functioning as a. kingpin rest and bolster side wall brace.

latter, said plate having a kingpin hole and functioning as a kingpin support, said bolster including a second horizontal plate positioned through said recess below the rst named plate and joining the bolster' side walls, saidsecond plate functioning as a kingpin rest and side wall brace.

3. A car truck bolster of the box girder-type and including parallel reenforcing ribs depending from its top and longitudinally extending continuously through its central portion on either side of its kingpin opening, a suitable lengthof rolled beam section positioned vertically between the bottoms of 'said flanges and the bolster bottom with its web parallel the bolsterside walls and its anges transverse said ribs, said beam section functioning as a center post and having the top portion of its web cut away to form a.`

kingpin recess, said `bolster including a plate positioned horizontally between and spanning the tops of the flanges of said beam section and the bottoms of said ribs,r said plate having a kingpin opening and functioning as a kingpin support, and

a second plate positioned horizontally through said recess beneath the rst named plate and joining the bolster side walls, said second plate functioning as a kingpin rest and bolster side wall brace.

4. A car truck bolster of the box girder type having its top formed from a rolled channel section integrally providing parallel ribs or secondary flanges extending longitudinally of the sec-` tion from the web thereof in parallel spaced relation respecting the flanges of the latter said web being solidopposite said ribs or secondary anges.

5. A car truck bolster of the box girder type having its top formed from a rolled channel section integrally providing parallel ribs or secondary anges extending longitudinally of the section in parallel spaced relation respecting the iianges of the latter, said ribs or secondary flanges lbeing joined to the bolster bottom at the bolster end or spring seat' portions by vertical plates welded in place so as to constitute depending4 continuations of said ribs or secondary ilanges joining the same to the bolster bottom.

6. A car truck bolster of the box girder type vhaving its top formed from a rolled channel section with a smaller rolled channel section of substantial length welded longitudinally thereto in web to web relation with the respectiveilanges parallel, said smaller channel section extending from beneath one of the bolster side bearing supporting portions to the other, and said bolster including vertical plates arranged in itsl 

